i am trying to create a search engine for a large listing site.
the search engine will search through 4 tables. each table being a separate listing category.
I am debating on weather to use the mysql full text search (MATCH/AGAINST)
or to create some custom setup without using the the full text.
i just want to know if the match/against is too "heavy" and only slow down my application. If there are around 15 fields to search in each table and there are 4 tables, thats 60 fields that have to be indexed as full text search. would that add a lot of "weight" to the database?

any help would be appreciated.
thanks,
gil